The questions we
hear most.

An ADU (accessory dwelling unit) is a second residence attached to or inside your existing home — usually a basement or garage conversion, or an addition. A DADU is a freestanding building on the same lot. DADUs offer more privacy and a separate entrance from the street side; attached ADUs are typically faster and less expensive because they reuse the existing structure.

Most Washington jurisdictions now allow up to 1,000 square feet for an ADU or DADU, with additional height allowances (typically up to 24 feet for a DADU) when the design includes a habitable upper floor. Maximum sizes depend on lot size and zone — we run a feasibility review before any design work begins.

ADUs (including basement and garage conversions) can be done under $100,000, depending on existing conditions, finishes, and the scope of structural and MEP work required. New-construction DADUs cost more, but many of the costs are dependent on the terrain, lot size, access, etc. We provide written, itemized estimates after a site walk, since every build is slightly different.

We take flat rate bids from all of the trades involved on each project, and manage them on a time and material basis. This means you’ll have fixed costs for each step of the project, with accurately estimated management fees.

Plan on six to nine months from plan approval to final inspection. Times vary based on many factors, but construction of these small homes can be quick! Permitting is actually a meaningful portion of this timeline — including planning, engineering, submission and inspections.

We collaborate with architects and designers, and we have in-house drafting for simpler projects. For ADUs and conversions, we can often handle design coordination directly. For larger projects or anything requiring formal architectural plans, we work with a short list of architects we trust.

Yes. We assign one project manager to handle the job from start to finish. You'll know who's on site and you'll have a direct line of communication with your builder.

We primarily serve Everett and Snohomish County, but work as far south as Seattle, and the 405 corridor including: Bellevue, Kirkland, Woodinville, Bothell, Mill Creek, Clearview, Edmonds, Mukilteo, Lynwood, Shoreline, etc

Call (206) 755-3868 or email “jetcityadu@gmail.com” with a few sentences about your project, your address, and any plans or inspiration you already have. We'll schedule a no-cost site walk, and within a week of that visit you'll have a written, itemized estimate… specifically written for YOUR project!